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省科学技术出版社七九年再版、周衍柏教授编著的《理论力学》“相对运动”一章有如下一道习题: 某人以一定的功率划船,逆流而上。当船经过一桥时,船上的渔竿掉入河中,两分钟后此人才发觉,立即回头追赶,追到渔竿之处是在桥的下游600米的地方,求河水的流速。这是一道物理习题,同时也是一道数学习题。同样类型的题目还在中师教科书或一些参考资料中出现。因其是相对运动,船和渔竿既有反向相遇,又有同向追及,历来被认为是一道难题。其实只要掌握这类问题的特点,解决这类问题并不困难,一
Provincial Science and Technology Press seven or nine years reprinted, Professor Zhou Yanbai edited “Theoretical Mechanics” “Relative Movement” chapter has a following exercise: Somebody with a certain power rowing, upstream. When the boat passed a bridge, the fishing rod fell into the river boat, two minutes later discovered this talent, immediately chase back, catch the fishing rod in the place is 600 meters below the bridge, seeking river flow. This is a physical exercise, but also a mathematical exercise. The same type of topic is also appearing in the textbook of Zhongshi or some references. Because it is a relative movement, both the ship and the fishing rod meet in reverse and catch up in the same direction, which has always been regarded as a difficult problem. In fact, as long as the characteristics of such problems are mastered, solving such problems is not difficult. First,